1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] 56 */ 57 /* ==================================================================== 58 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 59 * 60 * Redistribution and use in source and binary forms, with or without 61 * modification, are permitted provided that the following conditions 62 * are met: 63 * 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in 69 * the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3. All advertising materials mentioning features or use of this 73 * software must display the following acknowledgment: 74 * "This product includes software developed by the OpenSSL Project 75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 76 * 77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 78 * endorse or promote products derived from this software without 79 * prior written permission. For written permission, please contact 80 * openssl-core (at) openssl.org. 81 * 82 * 5. Products derived from this software may not be called "OpenSSL" 83 * nor may "OpenSSL" appear in their names without prior written 84 * permission of the OpenSSL Project. 85 * 86 * 6. Redistributions of any form whatsoever must retain the following 87 * acknowledgment: 88 * "This product includes software developed by the OpenSSL Project 89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 102 * OF THE POSSIBILITY OF SUCH DAMAGE. 103 * ==================================================================== 104 * 105 * This product includes cryptographic software written by Eric Young 106 * (eay (at) cryptsoft.com). This product includes software written by Tim 107 * Hudson (tjh (at) cryptsoft.com). 108 * 109 */ 110 /* ==================================================================== 111 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 112 * ECC cipher suite support in OpenSSL originally developed by 113 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. */ 114 115 #include <openssl/ssl.h> 116 117 #include <assert.h> 118 #include <limits.h> 119 #include <string.h> 120 121 #include <openssl/bn.h> 122 #include <openssl/buf.h> 123 #include <openssl/bytestring.h> 124 #include <openssl/ec_key.h> 125 #include <openssl/err.h> 126 #include <openssl/mem.h> 127 #include <openssl/sha.h> 128 #include <openssl/x509.h> 129 130 #include "../crypto/internal.h" 131 #include "internal.h" 132 133 134 CERT *ssl_cert_new(const SSL_X509_METHOD *x509_method) { 135 CERT *ret = (CERT *)OPENSSL_malloc(sizeof(CERT)); 136 if (ret == NULL) { 137 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 138 return NULL; 139 } 140 OPENSSL_memset(ret, 0, sizeof(CERT)); 141 ret->x509_method = x509_method; 142 143 return ret; 144 } 145 146 static CRYPTO_BUFFER *buffer_up_ref(CRYPTO_BUFFER *buffer) { 147 CRYPTO_BUFFER_up_ref(buffer); 148 return buffer; 149 } 150 151 CERT *ssl_cert_dup(CERT *cert) { 152 CERT *ret = (CERT *)OPENSSL_malloc(sizeof(CERT)); 153 if (ret == NULL) { 154 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 155 return NULL; 156 } 157 OPENSSL_memset(ret, 0, sizeof(CERT)); 158 159 ret->chain = sk_CRYPTO_BUFFER_deep_copy(cert->chain, buffer_up_ref, 160 CRYPTO_BUFFER_free); 161 162 if (cert->privatekey != NULL) { 163 EVP_PKEY_up_ref(cert->privatekey); 164 ret->privatekey = cert->privatekey; 165 } 166 167 ret->key_method = cert->key_method; 168 ret->x509_method = cert->x509_method; 169 170 if (cert->sigalgs != NULL) { 171 ret->sigalgs = (uint16_t *)BUF_memdup( 172 cert->sigalgs, cert->num_sigalgs * sizeof(cert->sigalgs[0])); 173 if (ret->sigalgs == NULL) { 174 goto err; 175 } 176 } 177 ret->num_sigalgs = cert->num_sigalgs; 178 179 ret->cert_cb = cert->cert_cb; 180 ret->cert_cb_arg = cert->cert_cb_arg; 181 182 ret->x509_method->cert_dup(ret, cert); 183 184 if (cert->signed_cert_timestamp_list != NULL) { 185 CRYPTO_BUFFER_up_ref(cert->signed_cert_timestamp_list); 186 ret->signed_cert_timestamp_list = cert->signed_cert_timestamp_list; 187 } 188 189 if (cert->ocsp_response != NULL) { 190 CRYPTO_BUFFER_up_ref(cert->ocsp_response); 191 ret->ocsp_response = cert->ocsp_response; 192 } 193 194 ret->sid_ctx_length = cert->sid_ctx_length; 195 OPENSSL_memcpy(ret->sid_ctx, cert->sid_ctx, sizeof(ret->sid_ctx)); 196 197 ret->enable_early_data = cert->enable_early_data; 198 199 return ret; 200 201 err: 202 ssl_cert_free(ret); 203 return NULL; 204 } 205 206 /* Free up and clear all certificates and chains */ 207 void ssl_cert_clear_certs(CERT *cert) { 208 if (cert == NULL) { 209 return; 210 } 211 212 cert->x509_method->cert_clear(cert); 213 214 sk_CRYPTO_BUFFER_pop_free(cert->chain, CRYPTO_BUFFER_free); 215 cert->chain = NULL; 216 EVP_PKEY_free(cert->privatekey); 217 cert->privatekey = NULL; 218 cert->key_method = NULL; 219 } 220 221 void ssl_cert_free(CERT *c) { 222 if (c == NULL) { 223 return; 224 } 225 226 ssl_cert_clear_certs(c); 227 c->x509_method->cert_free(c); 228 OPENSSL_free(c->sigalgs); 229 CRYPTO_BUFFER_free(c->signed_cert_timestamp_list); 230 CRYPTO_BUFFER_free(c->ocsp_response); 231 232 OPENSSL_free(c); 233 } 234 235 static void ssl_cert_set_cert_cb(CERT *c, int (*cb)(SSL *ssl, void *arg), 236 void *arg) { 237 c->cert_cb = cb; 238 c->cert_cb_arg = arg; 239 } 240 241 enum leaf_cert_and_privkey_result_t { 242 leaf_cert_and_privkey_error, 243 leaf_cert_and_privkey_ok, 244 leaf_cert_and_privkey_mismatch, 245 }; 246 247 /* check_leaf_cert_and_privkey checks whether the certificate in |leaf_buffer| 248 * and the private key in |privkey| are suitable and coherent. It returns 249 * |leaf_cert_and_privkey_error| and pushes to the error queue if a problem is 250 * found. If the certificate and private key are valid, but incoherent, it 251 * returns |leaf_cert_and_privkey_mismatch|. Otherwise it returns 252 * |leaf_cert_and_privkey_ok|. */ 253 static enum leaf_cert_and_privkey_result_t check_leaf_cert_and_privkey( 254 CRYPTO_BUFFER *leaf_buffer, EVP_PKEY *privkey) { 255 enum leaf_cert_and_privkey_result_t ret = leaf_cert_and_privkey_error; 256 257 CBS cert_cbs; 258 CRYPTO_BUFFER_init_CBS(leaf_buffer, &cert_cbs); 259 EVP_PKEY *pubkey = ssl_cert_parse_pubkey(&cert_cbs); 260 if (pubkey == NULL) { 261 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 262 goto out; 263 } 264 265 if (!ssl_is_key_type_supported(pubkey->type)) { 266 OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 267 goto out; 268 } 269 270 /* An ECC certificate may be usable for ECDH or ECDSA. We only support ECDSA 271 * certificates, so sanity-check the key usage extension. */ 272 if (pubkey->type == EVP_PKEY_EC && 273 !ssl_cert_check_digital_signature_key_usage(&cert_cbs)) { 274 OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 275 goto out; 276 } 277 278 if (privkey != NULL && 279 /* Sanity-check that the private key and the certificate match. */ 280 !ssl_compare_public_and_private_key(pubkey, privkey)) { 281 ERR_clear_error(); 282 ret = leaf_cert_and_privkey_mismatch; 283 goto out; 284 } 285 286 ret = leaf_cert_and_privkey_ok; 287 288 out: 289 EVP_PKEY_free(pubkey); 290 return ret; 291 } 292 293 static int cert_set_chain_and_key( 294 CERT *cert, CRYPTO_BUFFER *const *certs, size_t num_certs, 295 EVP_PKEY *privkey, const SSL_PRIVATE_KEY_METHOD *privkey_method) { 296 if (num_certs == 0 || 297 (privkey == NULL && privkey_method == NULL)) { 298 OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER); 299 return 0; 300 } 301 302 if (privkey != NULL && privkey_method != NULL) { 303 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_HAVE_BOTH_PRIVKEY_AND_METHOD); 304 return 0; 305 } 306 307 switch (check_leaf_cert_and_privkey(certs[0], privkey)) { 308 case leaf_cert_and_privkey_error: 309 return 0; 310 case leaf_cert_and_privkey_mismatch: 311 OPENSSL_PUT_ERROR(SSL, SSL_R_CERTIFICATE_AND_PRIVATE_KEY_MISMATCH); 312 return 0; 313 case leaf_cert_and_privkey_ok: 314 break; 315 } 316 317 STACK_OF(CRYPTO_BUFFER) *certs_sk = sk_CRYPTO_BUFFER_new_null(); 318 if (certs_sk == NULL) { 319 return 0; 320 } 321 322 for (size_t i = 0; i < num_certs; i++) { 323 if (!sk_CRYPTO_BUFFER_push(certs_sk, certs[i])) { 324 sk_CRYPTO_BUFFER_pop_free(certs_sk, CRYPTO_BUFFER_free); 325 return 0; 326 } 327 CRYPTO_BUFFER_up_ref(certs[i]); 328 } 329 330 EVP_PKEY_free(cert->privatekey); 331 cert->privatekey = privkey; 332 if (privkey != NULL) { 333 EVP_PKEY_up_ref(privkey); 334 } 335 cert->key_method = privkey_method; 336 337 sk_CRYPTO_BUFFER_pop_free(cert->chain, CRYPTO_BUFFER_free); 338 cert->chain = certs_sk; 339 340 return 1; 341 } 342 343 int SSL_set_chain_and_key(SSL *ssl, CRYPTO_BUFFER *const *certs, 344 size_t num_certs, EVP_PKEY *privkey, 345 const SSL_PRIVATE_KEY_METHOD *privkey_method) { 346 return cert_set_chain_and_key(ssl->cert, certs, num_certs, privkey, 347 privkey_method); 348 } 349 350 int SSL_CTX_set_chain_and_key(SSL_CTX *ctx, CRYPTO_BUFFER *const *certs, 351 size_t num_certs, EVP_PKEY *privkey, 352 const SSL_PRIVATE_KEY_METHOD *privkey_method) { 353 return cert_set_chain_and_key(ctx->cert, certs, num_certs, privkey, 354 privkey_method); 355 } 356 357 int ssl_set_cert(CERT *cert, CRYPTO_BUFFER *buffer) { 358 switch (check_leaf_cert_and_privkey(buffer, cert->privatekey)) { 359 case leaf_cert_and_privkey_error: 360 return 0; 361 case leaf_cert_and_privkey_mismatch: 362 /* don't fail for a cert/key mismatch, just free current private key 363 * (when switching to a different cert & key, first this function should 364 * be used, then |ssl_set_pkey|. */ 365 EVP_PKEY_free(cert->privatekey); 366 cert->privatekey = NULL; 367 break; 368 case leaf_cert_and_privkey_ok: 369 break; 370 } 371 372 cert->x509_method->cert_flush_cached_leaf(cert); 373 374 if (cert->chain != NULL) { 375 CRYPTO_BUFFER_free(sk_CRYPTO_BUFFER_value(cert->chain, 0)); 376 sk_CRYPTO_BUFFER_set(cert->chain, 0, buffer); 377 CRYPTO_BUFFER_up_ref(buffer); 378 return 1; 379 } 380 381 cert->chain = sk_CRYPTO_BUFFER_new_null(); 382 if (cert->chain == NULL) { 383 return 0; 384 } 385 386 if (!sk_CRYPTO_BUFFER_push(cert->chain, buffer)) { 387 sk_CRYPTO_BUFFER_free(cert->chain); 388 cert->chain = NULL; 389 return 0; 390 } 391 CRYPTO_BUFFER_up_ref(buffer); 392 393 return 1; 394 } 395 396 int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, size_t der_len, 397 const uint8_t *der) { 398 CRYPTO_BUFFER *buffer = CRYPTO_BUFFER_new(der, der_len, NULL); 399 if (buffer == NULL) { 400 return 0; 401 } 402 403 const int ok = ssl_set_cert(ctx->cert, buffer); 404 CRYPTO_BUFFER_free(buffer); 405 return ok; 406 } 407 408 int SSL_use_certificate_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) { 409 CRYPTO_BUFFER *buffer = CRYPTO_BUFFER_new(der, der_len, NULL); 410 if (buffer == NULL) { 411 return 0; 412 } 413 414 const int ok = ssl_set_cert(ssl->cert, buffer); 415 CRYPTO_BUFFER_free(buffer); 416 return ok; 417 } 418 419 int ssl_has_certificate(const SSL *ssl) { 420 return ssl->cert->chain != NULL && 421 sk_CRYPTO_BUFFER_value(ssl->cert->chain, 0) != NULL && 422 ssl_has_private_key(ssl); 423 } 424 425 STACK_OF(CRYPTO_BUFFER) *ssl_parse_cert_chain(uint8_t *out_alert, 426 EVP_PKEY **out_pubkey, 427 uint8_t *out_leaf_sha256, 428 CBS *cbs, 429 CRYPTO_BUFFER_POOL *pool) { 430 *out_pubkey = NULL; 431 432 STACK_OF(CRYPTO_BUFFER) *ret = sk_CRYPTO_BUFFER_new_null(); 433 if (ret == NULL) { 434 *out_alert = SSL_AD_INTERNAL_ERROR; 435 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 436 return NULL; 437 } 438 439 CBS certificate_list; 440 if (!CBS_get_u24_length_prefixed(cbs, &certificate_list)) { 441 *out_alert = SSL_AD_DECODE_ERROR; 442 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 443 goto err; 444 } 445 446 while (CBS_len(&certificate_list) > 0) { 447 CBS certificate; 448 if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) || 449 CBS_len(&certificate) == 0) { 450 *out_alert = SSL_AD_DECODE_ERROR; 451 OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH); 452 goto err; 453 } 454 455 if (sk_CRYPTO_BUFFER_num(ret) == 0) { 456 *out_pubkey = ssl_cert_parse_pubkey(&certificate); 457 if (*out_pubkey == NULL) { 458 *out_alert = SSL_AD_DECODE_ERROR; 459 goto err; 460 } 461 462 /* Retain the hash of the leaf certificate if requested. */ 463 if (out_leaf_sha256 != NULL) { 464 SHA256(CBS_data(&certificate), CBS_len(&certificate), out_leaf_sha256); 465 } 466 } 467 468 CRYPTO_BUFFER *buf = 469 CRYPTO_BUFFER_new_from_CBS(&certificate, pool); 470 if (buf == NULL) { 471 *out_alert = SSL_AD_DECODE_ERROR; 472 goto err; 473 } 474 475 if (!sk_CRYPTO_BUFFER_push(ret, buf)) { 476 *out_alert = SSL_AD_INTERNAL_ERROR; 477 CRYPTO_BUFFER_free(buf); 478 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 479 goto err; 480 } 481 } 482 483 return ret; 484 485 err: 486 EVP_PKEY_free(*out_pubkey); 487 *out_pubkey = NULL; 488 sk_CRYPTO_BUFFER_pop_free(ret, CRYPTO_BUFFER_free); 489 return NULL; 490 } 491 492 int ssl_add_cert_chain(SSL *ssl, CBB *cbb) { 493 if (!ssl_has_certificate(ssl)) { 494 return CBB_add_u24(cbb, 0); 495 } 496 497 CBB certs; 498 if (!CBB_add_u24_length_prefixed(cbb, &certs)) { 499 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 500 return 0; 501 } 502 503 STACK_OF(CRYPTO_BUFFER) *chain = ssl->cert->chain; 504 for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(chain); i++) { 505 CRYPTO_BUFFER *buffer = sk_CRYPTO_BUFFER_value(chain, i); 506 CBB child; 507 if (!CBB_add_u24_length_prefixed(&certs, &child) || 508 !CBB_add_bytes(&child, CRYPTO_BUFFER_data(buffer), 509 CRYPTO_BUFFER_len(buffer)) || 510 !CBB_flush(&certs)) { 511 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 512 return 0; 513 } 514 } 515 516 return CBB_flush(cbb); 517 } 518 519 /* ssl_cert_skip_to_spki parses a DER-encoded, X.509 certificate from |in| and 520 * positions |*out_tbs_cert| to cover the TBSCertificate, starting at the 521 * subjectPublicKeyInfo. */ 522 static int ssl_cert_skip_to_spki(const CBS *in, CBS *out_tbs_cert) { 523 /* From RFC 5280, section 4.1 524 * Certificate ::= SEQUENCE { 525 * tbsCertificate TBSCertificate, 526 * signatureAlgorithm AlgorithmIdentifier, 527 * signatureValue BIT STRING } 528 529 * TBSCertificate ::= SEQUENCE { 530 * version [0] EXPLICIT Version DEFAULT v1, 531 * serialNumber CertificateSerialNumber, 532 * signature AlgorithmIdentifier, 533 * issuer Name, 534 * validity Validity, 535 * subject Name, 536 * subjectPublicKeyInfo SubjectPublicKeyInfo, 537 * ... } */ 538 CBS buf = *in; 539 540 CBS toplevel; 541 if (!CBS_get_asn1(&buf, &toplevel, CBS_ASN1_SEQUENCE) || 542 CBS_len(&buf) != 0 || 543 !CBS_get_asn1(&toplevel, out_tbs_cert, CBS_ASN1_SEQUENCE) || 544 /* version */ 545 !CBS_get_optional_asn1( 546 out_tbs_cert, NULL, NULL, 547 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 0) || 548 /* serialNumber */ 549 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_INTEGER) || 550 /* signature algorithm */ 551 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 552 /* issuer */ 553 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 554 /* validity */ 555 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 556 /* subject */ 557 !CBS_get_asn1(out_tbs_cert, NULL, CBS_ASN1_SEQUENCE)) { 558 return 0; 559 } 560 561 return 1; 562 } 563 564 EVP_PKEY *ssl_cert_parse_pubkey(const CBS *in) { 565 CBS buf = *in, tbs_cert; 566 if (!ssl_cert_skip_to_spki(&buf, &tbs_cert)) { 567 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 568 return NULL; 569 } 570 571 return EVP_parse_public_key(&tbs_cert); 572 } 573 574 int ssl_compare_public_and_private_key(const EVP_PKEY *pubkey, 575 const EVP_PKEY *privkey) { 576 if (EVP_PKEY_is_opaque(privkey)) { 577 /* We cannot check an opaque private key and have to trust that it 578 * matches. */ 579 return 1; 580 } 581 582 int ret = 0; 583 584 switch (EVP_PKEY_cmp(pubkey, privkey)) { 585 case 1: 586 ret = 1; 587 break; 588 case 0: 589 OPENSSL_PUT_ERROR(X509, X509_R_KEY_VALUES_MISMATCH); 590 break; 591 case -1: 592 OPENSSL_PUT_ERROR(X509, X509_R_KEY_TYPE_MISMATCH); 593 break; 594 case -2: 595 OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE); 596 default: 597 assert(0); 598 break; 599 } 600 601 return ret; 602 } 603 604 int ssl_cert_check_private_key(const CERT *cert, const EVP_PKEY *privkey) { 605 if (privkey == NULL) { 606 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_PRIVATE_KEY_ASSIGNED); 607 return 0; 608 } 609 610 if (cert->chain == NULL || 611 sk_CRYPTO_BUFFER_value(cert->chain, 0) == NULL) { 612 OPENSSL_PUT_ERROR(SSL, SSL_R_NO_CERTIFICATE_ASSIGNED); 613 return 0; 614 } 615 616 CBS cert_cbs; 617 CRYPTO_BUFFER_init_CBS(sk_CRYPTO_BUFFER_value(cert->chain, 0), &cert_cbs); 618 EVP_PKEY *pubkey = ssl_cert_parse_pubkey(&cert_cbs); 619 if (!pubkey) { 620 OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_KEY_TYPE); 621 return 0; 622 } 623 624 const int ok = ssl_compare_public_and_private_key(pubkey, privkey); 625 EVP_PKEY_free(pubkey); 626 return ok; 627 } 628 629 int ssl_cert_check_digital_signature_key_usage(const CBS *in) { 630 CBS buf = *in; 631 632 CBS tbs_cert, outer_extensions; 633 int has_extensions; 634 if (!ssl_cert_skip_to_spki(&buf, &tbs_cert) || 635 /* subjectPublicKeyInfo */ 636 !CBS_get_asn1(&tbs_cert, NULL, CBS_ASN1_SEQUENCE) || 637 /* issuerUniqueID */ 638 !CBS_get_optional_asn1( 639 &tbs_cert, NULL, NULL, 640 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 1) || 641 /* subjectUniqueID */ 642 !CBS_get_optional_asn1( 643 &tbs_cert, NULL, NULL, 644 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 2) || 645 !CBS_get_optional_asn1( 646 &tbs_cert, &outer_extensions, &has_extensions, 647 CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 3)) { 648 goto parse_err; 649 } 650 651 if (!has_extensions) { 652 return 1; 653 } 654 655 CBS extensions; 656 if (!CBS_get_asn1(&outer_extensions, &extensions, CBS_ASN1_SEQUENCE)) { 657 goto parse_err; 658 } 659 660 while (CBS_len(&extensions) > 0) { 661 CBS extension, oid, contents; 662 if (!CBS_get_asn1(&extensions, &extension, CBS_ASN1_SEQUENCE) || 663 !CBS_get_asn1(&extension, &oid, CBS_ASN1_OBJECT) || 664 (CBS_peek_asn1_tag(&extension, CBS_ASN1_BOOLEAN) && 665 !CBS_get_asn1(&extension, NULL, CBS_ASN1_BOOLEAN)) || 666 !CBS_get_asn1(&extension, &contents, CBS_ASN1_OCTETSTRING) || 667 CBS_len(&extension) != 0) { 668 goto parse_err; 669 } 670 671 static const uint8_t kKeyUsageOID[3] = {0x55, 0x1d, 0x0f}; 672 if (CBS_len(&oid) != sizeof(kKeyUsageOID) || 673 OPENSSL_memcmp(CBS_data(&oid), kKeyUsageOID, sizeof(kKeyUsageOID)) != 674 0) { 675 continue; 676 } 677 678 CBS bit_string; 679 if (!CBS_get_asn1(&contents, &bit_string, CBS_ASN1_BITSTRING) || 680 CBS_len(&contents) != 0) { 681 goto parse_err; 682 } 683 684 /* This is the KeyUsage extension. See 685 * https://tools.ietf.org/html/rfc5280#section-4.2.1.3 */ 686 if (!CBS_is_valid_asn1_bitstring(&bit_string)) { 687 goto parse_err; 688 } 689 690 if (!CBS_asn1_bitstring_has_bit(&bit_string, 0)) { 691 OPENSSL_PUT_ERROR(SSL, SSL_R_ECC_CERT_NOT_FOR_SIGNING); 692 return 0; 693 } 694 695 return 1; 696 } 697 698 /* No KeyUsage extension found. */ 699 return 1; 700 701 parse_err: 702 OPENSSL_PUT_ERROR(SSL, SSL_R_CANNOT_PARSE_LEAF_CERT); 703 return 0; 704 } 705 706 STACK_OF(CRYPTO_BUFFER) * 707 ssl_parse_client_CA_list(SSL *ssl, uint8_t *out_alert, CBS *cbs) { 708 CRYPTO_BUFFER_POOL *const pool = ssl->ctx->pool; 709 710 STACK_OF(CRYPTO_BUFFER) *ret = sk_CRYPTO_BUFFER_new_null(); 711 if (ret == NULL) { 712 *out_alert = SSL_AD_INTERNAL_ERROR; 713 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 714 return NULL; 715 } 716 717 CBS child; 718 if (!CBS_get_u16_length_prefixed(cbs, &child)) { 719 *out_alert = SSL_AD_DECODE_ERROR; 720 OPENSSL_PUT_ERROR(SSL, SSL_R_LENGTH_MISMATCH); 721 goto err; 722 } 723 724 while (CBS_len(&child) > 0) { 725 CBS distinguished_name; 726 if (!CBS_get_u16_length_prefixed(&child, &distinguished_name)) { 727 *out_alert = SSL_AD_DECODE_ERROR; 728 OPENSSL_PUT_ERROR(SSL, SSL_R_CA_DN_TOO_LONG); 729 goto err; 730 } 731 732 CRYPTO_BUFFER *buffer = 733 CRYPTO_BUFFER_new_from_CBS(&distinguished_name, pool); 734 if (buffer == NULL || 735 !sk_CRYPTO_BUFFER_push(ret, buffer)) { 736 CRYPTO_BUFFER_free(buffer); 737 *out_alert = SSL_AD_INTERNAL_ERROR; 738 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 739 goto err; 740 } 741 } 742 743 if (!ssl->ctx->x509_method->check_client_CA_list(ret)) { 744 *out_alert = SSL_AD_INTERNAL_ERROR; 745 OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR); 746 goto err; 747 } 748 749 return ret; 750 751 err: 752 sk_CRYPTO_BUFFER_pop_free(ret, CRYPTO_BUFFER_free); 753 return NULL; 754 } 755 756 int ssl_add_client_CA_list(SSL *ssl, CBB *cbb) { 757 CBB child, name_cbb; 758 if (!CBB_add_u16_length_prefixed(cbb, &child)) { 759 return 0; 760 } 761 762 STACK_OF(CRYPTO_BUFFER) *names = ssl->client_CA; 763 if (names == NULL) { 764 names = ssl->ctx->client_CA; 765 } 766 if (names == NULL) { 767 return CBB_flush(cbb); 768 } 769 770 for (size_t i = 0; i < sk_CRYPTO_BUFFER_num(names); i++) { 771 const CRYPTO_BUFFER *name = sk_CRYPTO_BUFFER_value(names, i); 772 773 if (!CBB_add_u16_length_prefixed(&child, &name_cbb) || 774 !CBB_add_bytes(&name_cbb, CRYPTO_BUFFER_data(name), 775 CRYPTO_BUFFER_len(name))) { 776 return 0; 777 } 778 } 779 780 return CBB_flush(cbb); 781 } 782 783 void SSL_CTX_set_cert_cb(SSL_CTX *ctx, int (*cb)(SSL *ssl, void *arg), 784 void *arg) { 785 ssl_cert_set_cert_cb(ctx->cert, cb, arg); 786 } 787 788 void SSL_set_cert_cb(SSL *ssl, int (*cb)(SSL *ssl, void *arg), void *arg) { 789 ssl_cert_set_cert_cb(ssl->cert, cb, arg); 790 } 791 792 STACK_OF(CRYPTO_BUFFER) *SSL_get0_peer_certificates(const SSL *ssl) { 793 SSL_SESSION *session = SSL_get_session(ssl); 794 if (session == NULL) { 795 return NULL; 796 } 797 798 return session->certs; 799 } 800 801 STACK_OF(CRYPTO_BUFFER) *SSL_get0_server_requested_CAs(const SSL *ssl) { 802 if (ssl->s3->hs == NULL) { 803 return NULL; 804 } 805 return ssl->s3->hs->ca_names; 806 } 807 808 int ssl_check_leaf_certificate(SSL_HANDSHAKE *hs, EVP_PKEY *pkey, 809 const CRYPTO_BUFFER *leaf) { 810 SSL *const ssl = hs->ssl; 811 assert(ssl3_protocol_version(ssl) < TLS1_3_VERSION); 812 813 /* Check the certificate's type matches the cipher. */ 814 if (!(hs->new_cipher->algorithm_auth & ssl_cipher_auth_mask_for_key(pkey))) { 815 OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_CERTIFICATE_TYPE); 816 return 0; 817 } 818 819 /* Check key usages for all key types but RSA. This is needed to distinguish 820 * ECDH certificates, which we do not support, from ECDSA certificates. In 821 * principle, we should check RSA key usages based on cipher, but this breaks 822 * buggy antivirus deployments. Other key types are always used for signing. 823 * 824 * TODO(davidben): Get more recent data on RSA key usages. */ 825 if (EVP_PKEY_id(pkey) != EVP_PKEY_RSA) { 826 CBS leaf_cbs; 827 CBS_init(&leaf_cbs, CRYPTO_BUFFER_data(leaf), CRYPTO_BUFFER_len(leaf)); 828 if (!ssl_cert_check_digital_signature_key_usage(&leaf_cbs)) { 829 return 0; 830 } 831 } 832 833 if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 834 /* Check the key's group and point format are acceptable. */ 835 EC_KEY *ec_key = EVP_PKEY_get0_EC_KEY(pkey); 836 uint16_t group_id; 837 if (!ssl_nid_to_group_id( 838 &group_id, EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key))) || 839 !tls1_check_group_id(ssl, group_id) || 840 EC_KEY_get_conv_form(ec_key) != POINT_CONVERSION_UNCOMPRESSED) { 841 OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECC_CERT); 842 return 0; 843 } 844 } 845 846 return 1; 847 } 848 849 int ssl_on_certificate_selected(SSL_HANDSHAKE *hs) { 850 SSL *const ssl = hs->ssl; 851 if (!ssl_has_certificate(ssl)) { 852 /* Nothing to do. */ 853 return 1; 854 } 855 856 if (!ssl->ctx->x509_method->ssl_auto_chain_if_needed(ssl)) { 857 return 0; 858 } 859 860 CBS leaf; 861 CRYPTO_BUFFER_init_CBS(sk_CRYPTO_BUFFER_value(ssl->cert->chain, 0), &leaf); 862 863 EVP_PKEY_free(hs->local_pubkey); 864 hs->local_pubkey = ssl_cert_parse_pubkey(&leaf); 865 return hs->local_pubkey != NULL; 866 } 867 868 static int set_signed_cert_timestamp_list(CERT *cert, const uint8_t *list, 869 size_t list_len) { 870 CBS sct_list; 871 CBS_init(&sct_list, list, list_len); 872 if (!ssl_is_sct_list_valid(&sct_list)) { 873 OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_SCT_LIST); 874 return 0; 875 } 876 877 CRYPTO_BUFFER_free(cert->signed_cert_timestamp_list); 878 cert->signed_cert_timestamp_list = 879 CRYPTO_BUFFER_new(CBS_data(&sct_list), CBS_len(&sct_list), NULL); 880 return cert->signed_cert_timestamp_list != NULL; 881 } 882 883 int SSL_CTX_set_signed_cert_timestamp_list(SSL_CTX *ctx, const uint8_t *list, 884 size_t list_len) { 885 return set_signed_cert_timestamp_list(ctx->cert, list, list_len); 886 } 887 888 int SSL_set_signed_cert_timestamp_list(SSL *ssl, const uint8_t *list, 889 size_t list_len) { 890 return set_signed_cert_timestamp_list(ssl->cert, list, list_len); 891 } 892 893 int SSL_CTX_set_ocsp_response(SSL_CTX *ctx, const uint8_t *response, 894 size_t response_len) { 895 CRYPTO_BUFFER_free(ctx->cert->ocsp_response); 896 ctx->cert->ocsp_response = CRYPTO_BUFFER_new(response, response_len, NULL); 897 return ctx->cert->ocsp_response != NULL; 898 } 899 900 int SSL_set_ocsp_response(SSL *ssl, const uint8_t *response, 901 size_t response_len) { 902 CRYPTO_BUFFER_free(ssl->cert->ocsp_response); 903 ssl->cert->ocsp_response = CRYPTO_BUFFER_new(response, response_len, NULL); 904 return ssl->cert->ocsp_response != NULL; 905 } 906
